1 // SPDX-License-Identifier: GPL-2.0-or-later
11  * ADC<bb><c>S<sss>, where
13  * * c is the number of channels (1, 2, 4, 8)
18  * http://www.national.com/ds/DC/ADC<bb><c>S<sss>.pdf
32 #include <linux/hwmon-sysfs.h>
42 	u32 channels;  member
52 	struct adcxx *adc = spi_get_drvdata(spi);  in adcxx_show()  local
58 	if (mutex_lock_interruptible(&adc->lock))  in adcxx_show()
59 		return -ERESTARTSYS;  in adcxx_show()
61 	if (adc->channels == 1) {  in adcxx_show()
64 		tx_buf[0] = attr->index << 3; /* other bits are don't care */  in adcxx_show()
77 	value = value * adc->reference >> 12;  in adcxx_show()
80 	mutex_unlock(&adc->lock);  in adcxx_show()
95 	struct adcxx *adc = spi_get_drvdata(spi);  in adcxx_max_show()  local
98 	if (mutex_lock_interruptible(&adc->lock))  in adcxx_max_show()
99 		return -ERESTARTSYS;  in adcxx_max_show()
101 	reference = adc->reference;  in adcxx_max_show()
103 	mutex_unlock(&adc->lock);  in adcxx_max_show()
113 	struct adcxx *adc = spi_get_drvdata(spi);  in adcxx_max_store()  local
117 		return -EINVAL;  in adcxx_max_store()
119 	if (mutex_lock_interruptible(&adc->lock))  in adcxx_max_store()
120 		return -ERESTARTSYS;  in adcxx_max_store()
122 	adc->reference = value;  in adcxx_max_store()
124 	mutex_unlock(&adc->lock);  in adcxx_max_store()
132 	return sprintf(buf, "%s\n", to_spi_device(dev)->modalias);  in adcxx_name_show()
149 /*----------------------------------------------------------------------*/
153 	int channels = spi_get_device_id(spi)->driver_data;  in adcxx_probe()  local
154 	struct adcxx *adc;  in adcxx_probe()  local
158 	adc = devm_kzalloc(&spi->dev, sizeof(*adc), GFP_KERNEL);  in adcxx_probe()
159 	if (!adc)  in adcxx_probe()
160 		return -ENOMEM;  in adcxx_probe()
163 	adc->reference = 3300;  in adcxx_probe()
164 	adc->channels = channels;  in adcxx_probe()
165 	mutex_init(&adc->lock);  in adcxx_probe()
167 	mutex_lock(&adc->lock);  in adcxx_probe()
169 	spi_set_drvdata(spi, adc);  in adcxx_probe()
171 	for (i = 0; i < 3 + adc->channels; i++) {  in adcxx_probe()
172 		status = device_create_file(&spi->dev, &ad_input[i].dev_attr);  in adcxx_probe()
174 			dev_err(&spi->dev, "device_create_file failed.\n");  in adcxx_probe()
179 	adc->hwmon_dev = hwmon_device_register(&spi->dev);  in adcxx_probe()
180 	if (IS_ERR(adc->hwmon_dev)) {  in adcxx_probe()
181 		dev_err(&spi->dev, "hwmon_device_register failed.\n");  in adcxx_probe()
182 		status = PTR_ERR(adc->hwmon_dev);  in adcxx_probe()
186 	mutex_unlock(&adc->lock);  in adcxx_probe()
190 	for (i--; i >= 0; i--)  in adcxx_probe()
191 		device_remove_file(&spi->dev, &ad_input[i].dev_attr);  in adcxx_probe()
193 	mutex_unlock(&adc->lock);  in adcxx_probe()
199 	struct adcxx *adc = spi_get_drvdata(spi);  in adcxx_remove()  local
202 	mutex_lock(&adc->lock);  in adcxx_remove()
203 	hwmon_device_unregister(adc->hwmon_dev);  in adcxx_remove()
204 	for (i = 0; i < 3 + adc->channels; i++)  in adcxx_remove()
205 		device_remove_file(&spi->dev, &ad_input[i].dev_attr);  in adcxx_remove()
207 	mutex_unlock(&adc->lock);  in adcxx_remove()